Help please in identifying multiple enquireis

I have a yearly spreadsheet which includes the post code and date that a client made an enquiry (Col A = UK post code, Col B = date). I need to be able to identify those clients who have made a second call within 3 time periods:
1. 1 day (or 24 hours) of their first call
2. 2 days (or 48 hours) of their first call and,
3. 5 days (or 120 hours) of their first call.

ideally the re-occurrences would be put into individual columns.
Is anyone able to help me out here??
Many thanks
Vin 1602

Thanks Pepe - I have attached a sample w/book. I can sort the data according to Postcode then Date, but need help identifying re-occurences. Hope it is apparent....

Thamks Pepe - however, when I copy your formulas in G2 -I2, and drag these down the columns to apply them, I get the resulkts in w/book 'Sheet 1'. Also , the formula in col G inserts "tru" but yourworked data states"true" in col G.
Could you help explain? Many thanks (see attached file)

The formula in sheet 1 are not correct, only those in the sheet AFTER[/QUOTE]

Hi again. If I copy your formula from the AFTER page and insert in a new page (as in my w/book heet 1) and scroll down, I do not get the results you get in your downloaded file. I cannot see how formula in your col I will insert "True" when the formula says "tru", for eample. Pleae can you explain.
Thanks